<script language="JavaScript">
//屏蔽鼠标右键、Ctrl+N、Shift+F10、F5刷新、退格键
//屏蔽F1帮助
function window.onhelp()
{
return false
}
function KeyDown()
{
//alert(event.keyCode);
//屏蔽 Alt+ 方向键 ← 屏蔽 Alt+ 方向键 →
if ((window.event.altKey)&&((window.event.keyCode==37)||(window.event.keyCode==39)))
{
//alert("不准你使用ALT+方向键前进或后退网页！");
event.returnValue=false;
}
//屏蔽退格删除键,屏蔽 F5 刷新键,Ctrl + R
if ((event.keyCode==116)||(event.ctrlKey && event.keyCode==82))
{
event.keyCode=0;
event.returnValue=false;
}

//屏蔽 Ctrl+n
if ((event.ctrlKey)&&(event.keyCode==78))
{
event.returnValue=false;
}

//屏蔽 shift+F10
if ((event.shiftKey)&&(event.keyCode==121))
{
event.returnValue=false;
}

//屏蔽 shift 加鼠标左键新开一网页
if (window.event.srcElement.tagName == "A" && window.event.shiftKey)
{
window.event.returnValue = false;
}

//屏蔽Alt+F4
if ((window.event.altKey)&&(window.event.keyCode==115))
{
window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");
return false;
}

//屏蔽Ctrl+A
if((event.ctrlKey)&&(event.keyCode==65))
{
return false;
}

}
</script>